Draft appliance for furnaces



Ot. 20, 1931. A. JQ REED' 1,827,910

' DRAFT APPLIANCE Fon*FUR'NAC'FS Filed July 28, 1930 ATTO/THEY,

man ed.' 2o, 1931' rezan ARTHURY J. REED, or PHILADELPHIA, PENNSYLVANIA.

DRAFT APPLIANCE Fon PURNAGES y Application mea July es, ieaaysei'rliai No. 471,127.

My invention relates to a dra/ft appliance for furnaces and has for its object to provide a draft appliance connected with and incorporating a closure plate to an "ash pit' door and so constructed as to provide for its convenient Withdrawal from its operative position in connection with the furnace and for the rm closing of the ash pit door when the appliance is in operative position.

The nature of my improvements will be best understood as described in connection with the drawings, in which Figure l is a plan view showing -a portion of the furnace in horizontal section taken through the ash pit door opening and my appliance in the position it occupies when the closure plate is brought against the ash pit door opening but not' yet clamped against the doorway.

and mechanism shown in Fig.V l, viewed from the left hand side of that figure, and

Figure 3 is a frontl elevation of the same parts.

A indicates the furnace having anash pit doorway, asy indicated at A1. B is the pivotal support adapted to be secured to the floor of the room in which the furnace is located atv some distance from the furnace and having as shown a pivot pin, indicated at B1. Pivoted on this support is the head indicated at C, upon which is supported a motor D and head also supports a laterally extending arm, indicated at F, which rotates with the head and which is Vformed or provided with spaced lugs F1 F1 longitudinally slotted as indicated at f1 and also atits end with a lug F2. G.

G' are cross bars formed as shown with trans-k of the arm F. In this wayv I provide for both a vertical and transverse adjustment of the bars G and the parts carried thereby including the closure plate to-secure to the ends of the cross bars G, which frame Vis made up of 5 a portion' G1 running parallel to the cross bars Figure 2 is a side elevation ofthe parts Y formedas a ratchet, asshown.

G and having laterally extending arms G2 G2 which are slottedto permit of adjustment as indicated at g2'vand which when adjusted are secured to the endsofthe bars G by clamping screws indicated at Q. f I indicates the the -arm* F through the plates Gand G1 by pinsI, I, etc., secured to the"backofthel l `closure plat-e and extending through perforationsin the'plates G and G1. A J, J, etc. are

springs surrounding the pins l andv located I betweenl the closure plate andthe plate G1. K, K1', K2 indicate an air conduit connecting they fan E with the ash pit closure plate H, and opening through said plate. This conduit is shown as incorporating a flexible section,v in? 'dicated 'at K1.- L, L1 indicate' toggle ylinks of which the link Lis pivotally'connected vat lZ to the lug F2 extending out from the 'arm F and pivotally-v connected at Z1 with the link vL1the end of which is'formed to make af ready engagement with the stop M secured to the oor of the room Al and l'preferably vis provided with a nger L2 vto engage the link L when the toggle is straightened out and the 'link L is provided with a handle Aas indicated at'N'. O,'O1is a bent lever pivoted tothe link L andv carrying at its free' end a hook, as indicated at O2, adapted to engage with an extension F3 of the arm F. This rovde orthe Closing 0f the lClOsu're-plate H against the ash-'pit .door opening. The Patch et detent M is also secured to the floor of thefurnace room-at va properdistance to be engaged by t-he toggle lever when the closure Vplate is in' operative position, the framing G, G1, G2 which supports the closure plate is then adjusted-onthe arm F-,j if necessary, tobring theclosure-plateinto proper regis; try with the ash pit door opening. To bring the appliance into-operative position it is' brought up againstl the ashpit door opening, as shown in Fig; l, the toggle leverY L11 is enbent lever is provided with a leverk extension a fan E, driven by the motor. The pivoted O3 The link L1 toggle straightened out s0 that it exerts a forward push on the arm F and through the plates G1 secured to the arm F pressure is -exerted against the springs J, with the result that the door is firmly clamped against the rims of the ash pit door opening and the appliance is in full operative position for delivering air to the furnace ash pit.

When it is desired to open the ash pit doorway it is only necessary to lift the toggle as by its handle N and pull it up to a position in which the hooked end O2 of the bent lever O, O1 will engage the detent F3, the effect of which is to hold the toggle levers up in inoperative position so that the whole appliance can be swung away, giving -full accessto the ash pit. j

When the appliance'is again brought back to position in whichV the closure fits against the ash pit doorway pressure onV thev arm O3 will lift the hook from engagement with the detent and permit the toggle link L1 to engage the detent M preparatory to a clamping of the closure plate in operative position. It will be observed that my described construction provides not only forfan adjustment of the closure platerthrough an adjustment of the frame G, G1, G2 onthe arm F, but also provides for a free angular adjustment of the elosure plate on the ash pit door rim by reason of the fact that the springs J make such an angular adjustment practicable.

The construction which I have illustrated and described is, I believe, the bes'gembodiment of my invention but is capable of modi` iicat-ions without departing Vfrom the spirit of my invention. i

VHaving now described my invention, what I claim as new and desire to secure by Letters Patent, is: i v

l. A draft appliance for furnaces comprising a pivotal support, a head rotatively supportedl thereon andl supporting a motor and fan, awlaterally extending arm secured to and rotated with the head, an ash doorway closure plate adjustably supported on said arm, an air conduit connecting the fan and closure plate and opening through said plate 1 and means for clamping the plate againstan ash pitdoorway. f j j 2. A draft appliance for furnaces comsists in al toggle, one link of which is pivotally connected to the arm and the other, link of whi'chis adapted to engage with a detent on the floor.

' 4. A furnace draft appliance as called for in claim 2 in which the clamping device consists in a toggle one link of which is pivotally connected tothe arm and the other link of which is adapted to engage with a detent on the iioor, said toggle links being provided with a latching device for holding them in non-operative position.

ARTHUR J. REED.

prising a pivotal support, a head rotatively Y supported thereon and supporting aV motor,`

and fan, alaterally extending arm secured to and rotating with the head, an ash: door-4 way closure plate adjustably supported on said arm and spaced therefrom by compressible springs, an air conduitconnecting the fan and said plate and opening through said? plate, and clamping mechanism actingjon the arm and through the springs to secure the plate against an ash doorway.

3.. A. furnace draft appliance as calledfor, V 5

r' in claim 2 in 'which the clamping device con- 

